Opteka
ET-65III Lens Hood for the Canon EF 85mm f/1.8 USM, 100mm f/2, SF EF 135mm f/2.8
& 100-300mm f/4.5-5.6 Lenses Brand New, 1 Year WarrantyThe addition
of a lens hood can help prevent flares--those circles of light that can
accompany images where a strong light source is just outside the fame. These
types of lens flares occur when indirect light rays pass through the front lens
elements but don't make it all the way through to the image sensor. Opteka's
ET-65III Lens Hood is designed for the Canon EF 85mm f/1.8 USM, 100mm f/2, SF EF
135mm f/2.8 & 100-300mm f/4.5-5.6 Lenses. Lens hoods are primarily designed to
prevent unwanted stray light from entering the lens by extending and shading the
end of the lens. In addition, since the end of the lens is extended, you also
get the added benefit of some extra protection from accidental impact. This
dedicated lens hood is designed to match the specific focal length of the lens
it was designed for.